Book Banning has existed in America since colonial times, when legislatures and royal governors enacted laws against blasphemy and seditious libel. Legislatures in the early American republic passed laws against obscenity. Though freedom of the press has grown significantly over the course of the twentieth century, book banning and related forms of censorship have persisted due to cyclical concerns about affronts to cultural, political, moral, and religious orthodoxy.

Thanks to the ALA for their Banned & Challenged Books lists.